I'm sure they'll all bend rail, if that's what you mean by "work."
They'll probably do better than bending rail around a bucket or washtub,
or some such. They can bend the rail without putting a twist in it.
I made my own bender. It's easy enough to do if you have a lathe, and not
impossible if you don't have one. I read of a bender made using sliding
door rollers. All you need are two stationary rollers and an adjustable
third roller between them. If you can't contour the rollers to fit the
rail, use ones thin enough to just press on the rail web. You can put a
crank on a roller to move the rail through the device, but if you don't, I
think you can do just as well pushing and pulling the rail through the
It takes some trial and error to get the curve you want. You may have to
bend the rail a little at a time to get it right. Once you've done one
rail, if you put a fresh one through the bender with the same adjustment,
the second rail's curve will be entirely different. That's probably due
to work hardening of the first rail. The second rail won't be hardened,
and it will behave differently. If you have a big enough range of motion
of your movable roller, you can also straighten already curved rail.
I've made a bunch of switches. They're designed to be a 12' radius curve
coming into the tangent, which makes them about #9. With that radius you
don't really need a rail bender, at least with code 250 aluminum rail.
The rail is flexible enough to follow that curve without straining it.
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